JNK1 controls mast cell degranulation and IL-1β production in inflammatory arthritis

Monica Guma, Jun Ichi Kashiwakura, Brian Crain, Yuko Kawakami, Bruce Beutler, Gary S. Firestein, Toshiaki Kawakami, Michael Karin, Maripat Corr

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


Rheumatoid arthritis (RA) is a chronic inflammatory disease marked by bone and cartilage destruction. Current biologic therapies are beneficial in only a portion of patients; hence small molecules targeting key pathogenic signaling cascades represent alternative therapeutic strategies. Here we show that c-Jun N-terminal kinase (JNK) 1, but not JNK2, is critical for joint swelling and destruction in a serum transfer model of arthritis. The proinflammatory function of JNK1 requires bone marrow-derived cells, particularly mast cells. Without JNK1, mast cells fail to degranulate efficiently and release less IL-1β after stimulation via Fcγ receptors (FcyRs). Pharmacologic JNK inhibition effectively prevents arthritis onset and abrogates joint swelling in established disease. Hence, JNK1 controls mast cell degranulation and FcγR-triggered IL-1β production, in addition to regulating cytokine and matrix metalloproteinase biosynthesis, and is an attractive therapeutic target in inflammatory arthritis.

Original languageEnglish (US)
Pages (from-to)22122-22127
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number51
StatePublished - Dec 21 2010


  • Fcγ receptor
  • Immune complex

ASJC Scopus subject areas

  • General


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